Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2a89a499f07760…

MALICIOUS

PDF

90.4 KB Created: 2021-03-25 05:22:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a7b87f56d5e92fc35682281df22e8a6 SHA-1: 4ef12c1378c133940eefbab0f54c97effc6c709b SHA-256: ef2a89a499f077606c5649a2efb598bd2112b1c03f4abab9b54da869a7cc9b03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to SEO-optimized content, suggesting a link farm or phishing lure. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The primary malicious URL identified is 'https://bologen.ru/wix?keyword=generalzoi+pony+creator+apk', which is likely used to redirect users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/wix?keyword=generalzoi+pony+creator+apk PDF link annotation
    • http://kfnwejfnkwheklf.space/269116231729cb6g.pdfIn PDF document text
    • http://ooovseanalizi.ru/dragon_city_breeding_guide_2017sj0uf.pdfIn PDF document text
    • http://byseles.xyz/minecraft_guide_to_redstone_free_downloadb4ybe.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/navimu.pdfIn PDF document text
    • http://supportcopyright.net/guzenutapevenokugub8whpd.pdfIn PDF document text
    • http://vipadminler.org/how_to_take_battery_out_of_jitterbug_phoneco3df.pdfIn PDF document text
    • http://dithetsen.xyz/hamilton_beach_easy_reach_countertop_toaster_oven_4-slicesiiffl.pdfIn PDF document text
    • http://kungfumalibu.com/the_living_bible_catholic_large_print_editionteed4.pdfIn PDF document text
    • http://storeyou.store/learn_sql_the_hard_way_downloadnh40b.pdfIn PDF document text
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/3061498.pdfIn PDF document text
    • https://satiwumufov.weebly.com/uploads/1/3/4/7/134724604/fajemawezuzor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeponowon/lilenijosepigom.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/barbecue_restaurant_business_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/sizajomufujatofizumol.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/capillary_action_of_water.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/ielts_speaking_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6f613e-81e2-4d47-bddf-9733ffbc5d18/lamborghini_gallardo_lp560-4_spyder_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/adivina_quien_soy_esta_noche_saga.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/android_onesignal_push_notification_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6945897-3084-413c-bf19-783e82e96297/how_to_turn_on_coleman_mobile_home_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/020ebad3-2730-4d47-be3f-53fcdce64fab/28599769347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5fb436-bbf4-49bd-898a-0bc77042936f/call_of_cthulhu_7th_edition_character_sheet_editable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509faaf1-6454-44c7-b085-ddf7a0566ef2/dovefufewex.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8F 4996 bytes
SHA-256: 0e1434878ec3d3b4cf7782581c63ff494089a65f1cdaf6d847d0cc1602310120
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 11600 bytes
SHA-256: ca468c61e6ba6a2637994bfc27e0e56128487f57f135d811522c0983312c6107
font_02_sfnt_off000146a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A0 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67